Compost Activator
(Humification Agent)
SoilFixer Compost Humification Agent is a compost activator that boosts microbial activity and speeds up decomposition. It contains biochar granules, trace minerals, and composting microbes to increase humus formation from under 5% to as much as 40%. The biochar improves airflow, reduces odours, and captures nutrients for slow release. Perfect for gardeners wanting richer, more fertile compost and Terra Preta-style soil.
If you need large-quantity loose loads (e.g. 10–20 tonnes), please contact us.
SoilFixer Compost Activator (Humification Agent)
Make your own super compost containing higher levels of colloidal humus and biochar.
(Follow our links to read more about super compost, colloidal humus, and humification.)
Benefits of Adding the Activator to Your Compost Heap / Bin
- Boost plant growth and crop yield — in our tests, by up to 100% (see note *)
- Your compost will contain more of the vital colloidal humus — it will look and feel smoother and stickier
- Make a positive, long-term improvement in your soil — colloidal humus and biochar are long-lasting and highly effective at improving fertility
- Make a groundbreaking contribution to the environment — colloidal humus and biochar are stable forms of organic carbon that can survive in soil for hundreds of years
- Be amazed at how much better compost can be!
* Note: In our tests, we’ve seen growth and crop yield increases of up to 100% (double!) using Biochar Super Compost (SF60) made from green waste with this composting agent. While all plant growth testing is variable, we are confident your improved compost will deliver at least a 20% yield increase.
Who Should Buy It?
- All composters wanting to improve the quality and performance of their compost
- Home composters using traditional garden (green waste) ‘cold’ composting in plastic Darlex or pallet-frame bins
- Hot composting systems such as HOTBIN, Ridan and Rocket®
(SoilFixer acknowledges these trademarks — this mention does not imply endorsement.) - Industrial composting sites using windrows or IVC systems
Specification
- Black granular mix
- 100% passes through 13 mm square mesh sieve
- Includes small amounts of compost and compost microbes for faster inoculation
- Contains biochar granules to aid airflow, reduce odours, and absorb nutrients for later release
- Includes mineral oxides (trace mineral nutrients)
- Available in 10 kg and 20 kg sacks
How Do I Use the Compost Humification Agent?
- Each time you add new waste to the compost bin, sprinkle the agent on top and rake it in
- Use 100g per 5 kg of waste
(≈ one mugful or a large handful per 7–9 litres — around one kitchen caddy or bucket) - This powder boosts the formation of colloidal humus from typical levels of under 5% to 10–40%
This patent-pending super composting agent is unlike any existing compost activator, accelerator, or inoculant.
It was developed by Tony Callaghan, inventor of the patented HOTBIN composting system, following years of research into making more of the “really good stuff” that improves plant growth.
(Read more at the SoilFixer website)
What Is It Made From?
A proprietary formula developed by SoilFixer, containing:
- Biochar
- Micronised powders
- All ingredients are from sustainable, natural sources and are 100% organic
(If you’re curious how other compost activators compare, read our compost activators review.)
Shelf Life
When stored dry, the product has no expiry date — its ingredients do not degrade in air or soil.
Storage Advice
- Store in the tub outdoors, with the lid on to prevent rain ingress
- Keep sacks covered and dry
Summary
This granular powder delivers more than typical compost accelerators, catalysts, inoculants or activators.
Sprinkle it onto your compost waste each time you add new material to your heap or bin.
It actively promotes the formation of highly beneficial colloidal humus — helping you make compost that’s truly next-level.
